diff --git a/arch/mips/src/mips32/Toolchain.defs b/arch/mips/src/mips32/Toolchain.defs
index 21974a88ae..5aeed13bb9 100644
--- a/arch/mips/src/mips32/Toolchain.defs
+++ b/arch/mips/src/mips32/Toolchain.defs
@@ -104,12 +104,14 @@ ifeq ($(CONFIG_DEBUG_CUSTOMOPT),y)
 endif
 
 ifeq ($(CONFIG_ARCH_MIPS_M14K),y)
-  MIPS_MARCH = 24kc
-  MIPS_MPROCESSOR = elf32pic32mx
-  MIPS_MICROMIPS = -mmicromips
-else
   MIPS_MARCH = m14k
   MIPS_MPROCESSOR = elf32pic32mz
+# MIPS_MICROMIPS = -mmicromips
+# MIPS_MICROMIPS = -mmicromips -minterlink-mips16 -mno-jals
+  MIPS_MICROMIPS = -mmicromips -minterlink-compressed
+else
+  MIPS_MARCH = 24kc
+  MIPS_MPROCESSOR = elf32pic32mx
   MIPS_MICROMIPS =
 endif
 
diff --git a/configs/pic32mz-starterkit/nsh/Make.defs b/configs/pic32mz-starterkit/nsh/Make.defs
index 51a9635864..5562a041fc 100644
--- a/configs/pic32mz-starterkit/nsh/Make.defs
+++ b/configs/pic32mz-starterkit/nsh/Make.defs
@@ -98,6 +98,7 @@ CXXFLAGS = $(ARCHCXXFLAGS) $(ARCHWARNINGSXX) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS)
 CXXPICFLAGS = $(ARCHPICFLAGS) $(CXXFLAGS)
 CPPFLAGS = $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES)
 AFLAGS = $(CFLAGS) -D__ASSEMBLY__
+LDFLAGS = # -no-isn32 --relax
 
 NXFLATLDFLAGS1 = -r -d -warn-common
 NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)/binfmt/libnxflat/gnu-nxflat-gotoff.ld -no-check-sections
diff --git a/include/nuttx/net/netconfig.h b/include/nuttx/net/netconfig.h
index 4f654e809c..4c6f58d15b 100644
--- a/include/nuttx/net/netconfig.h
+++ b/include/nuttx/net/netconfig.h
@@ -251,6 +251,8 @@
 #  define UDP_IPv6_MSS(d)    UDP_MSS(d,IPv6_HDRLEN)
 #  define ETH_IPv6_UDP_MSS   ETH_UDP_MSS(IPv6_HDRLEN)
 #  define SLIP_IPv6_UDP_MSS  SLIP_UDP_MSS(IPv6_HDRLEN)
+
+#  define MAX_IPv6_UDP_MSS   __MAX_UDP_MSS(IPv6_HDRLEN)
 #  define MAX_UDP_MSS        __MAX_UDP_MSS(IPv6_HDRLEN)
 #endif
 
@@ -258,16 +260,19 @@
 #  define UDP_IPv4_MSS(d)    UDP_MSS(d,IPv4_HDRLEN)
 #  define ETH_IPv4_UDP_MSS   ETH_UDP_MSS(IPv4_HDRLEN)
 #  define SLIP_IPv4_UDP_MSS  SLIP_UDP_MSS(IPv4_HDRLEN)
+
 #  define MIN_IPv4_UDP_MSS   __MIN_UDP_MSS(IPv4_HDRLEN)
 #  define MIN_UDP_MSS        __MIN_UDP_MSS(IPv4_HDRLEN)
-#  undef MAX_UDP_MSS
+
+#  undef  MAX_UDP_MSS
+#  define MAX_IPv4_UDP_MSS   __MAX_UDP_MSS(IPv4_HDRLEN)
 #  define MAX_UDP_MSS        __MAX_UDP_MSS(IPv4_HDRLEN)
 #endif
 
 /* If IPv6 is support, it will have the smaller MSS */
 
 #ifdef CONFIG_NET_IPv6
-#  undef MIN_UDP_MSS
+#  undef  MIN_UDP_MSS
 #  define MIN_IPv6_UDP_MSS   __MIN_UDP_MSS(IPv6_HDRLEN)
 #  define MIN_UDP_MSS        __MIN_UDP_MSS(IPv6_HDRLEN)
 #endif